<template>
    <div class="song-list">
        <van-nav-bar
        title="歌单详情"
        left-text="返回"
        left-arrow
        @click-left="onClickLeft"/>
    <div class="header">
        <img :src="song.logo" alt="">
        <h4>{{song.dissname}}</h4>
        <div class="nick">
            <img :src="song.headurl" alt="">
            <span>{{song.nickname}}</span>
        </div>
        <span>播放量:{{song.visitnum|numFilter(1)}}万</span>
    </div>
    <!--歌单列表-->
    <div class="list">
        <van-list
        v-model="loading"
        :finished="finished"
        finished-text="没有更多了"
        @load="onLoad">
        <div v-for="(item,index) in list" :key="index" :title="item" class="song">
            <h3>{{item.songname}}</h3>
            <div class="singers">
                <span v-for="(singer,index) in item.singer" :key="singer.id">
                    {{singer.name}}
                    <span v-show="index!=item.singer.length-1">/</span>
                </span>
                <span v-show="item.albumname">
                    <span>.</span>
                    <span>{{item.albumname}}</span>
                </span>
            </div>  
            </div>
        </van-list>
    </div>
    </div>  
</template>
<script>
export default{
    data(){
        return{
            song:{
                dissname: "",
                logo: "",
                headurl: "",
                nickname: "",
                visitnum: 0,
            },
            songlist:[],
            songnum:0,
            list:[],
            loading:false,
            finished:false,
        };
    },
    created(){
        this.getListData()
    },
    methods:{
        getListData(){
            this.$request('get','/songlist?id=' + this.$route.params.id)
            .then((res)=>{
                console.log(res);
                this.song.dissname = res.data.dissname;
                this.song.logo = res.data.logo;
                this.song.headurl = res.data.headurl;
                this.song.nickname = res.data.nickname;
                this.song.visitnum = res.data.visitnum;
                 this.songlist=res.data.songlist;
                 this.songnum=res.data.songnum;
                
            }
            ); 
},
onClickLeft(){
    //如果历史极力大于1，那么返回到上一层，反之返回到跟路由
    window.history.length > 1 ? this.$router.go(-1) : this.$router.push('/');
},
onLoad(){
    setTimeout(() => {
        this.list = this.list.concat(this.songlist.splice(0,10))

        //加载状态结束
        this.loading=false;
        //数据全部加载完成
        if(this.list.length >= this.songnum){
            this.finished = true;
        }
    },1000)
},
},
filters:{
        //处理播放量的显示格式
        /**
         * param num:小数位固定的位数
         * param value:小数的数值
         */
        numFilter(value,num){
            //把小数位固定为num位
            return parseFloat(value/10000).toFixed(num)
        }
    }
};

</script>
<style scoped>
.header > img {
    width: 50%;
    border-radius: 1rem;
}
.nick{
    overflow: hidden;
}
.nick > img {
    width: 1.5rem;
    border-radius: 50%;
    margin-right: 0.5rem;
}
.nick > span {
    height: 2rem;
    display: inline-block;
    vertical-align: middle;
    font-size: 0.8rem;
}
.header > span {
    font-size: 0.9rem;
}
.song{
    margin-bottom: 1rem;
}
.song>h3{
    text-align: left;
    font-size: 1rem;
    padding: 0 2rem;
    margin: 0;
}
.singers{
    text-align: left;
    padding: 0 2rem;
}
.singers span{
    font-size: 0.8rem;
    color: gray;
}
.singers>span:nth-last-child(1)>span:nth-child(1){
    margin: 0 0.3rem;
    font-weight:900;
    color: red;
}
</style>